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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98da2421c577b6ea1fb932afb9c1289ed4cf26a7804b76f5d65ebeb449c4e606' 
  AND token = 'G+7AD/pdIXaPkXjU9oCVCGjYv2m26p5uepZasH9du5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}