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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d1a72894f5fccc3b67a43b4421bfd1b5d415baf71a1150bcbc0b3a0afbbf88' 
  AND token = 's7Tky764C4p3z9IU6C72PaLanABQXBcNxl51Xn12nf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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