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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e4d7ea58c569b867226a0bc622d298c5720331ac139a196ca18d089050d26d' 
  AND token = '3Ok+3Rk/0RFGIybZEkm4zWQGLJ642uvbHKYC/qA34VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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