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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b569aeb6ecb46de657d19328c7e6c64b530a42b142230ec9973fa70abab213' 
  AND token = 'DbcELu1QKgEEMP+ubP4FeR7jHjCc3wKVIyyVv4BPIoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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