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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6098b65088d7ff9179e104f125ef817c23fb94f278f5d7c720ea19fb2a6d016b' 
  AND token = 'CFH09qXFljXXTXgN8G3icr5UHgczMz7C/rmnnIaUs3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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