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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e190331f965b97abdeab89a2c7b5bdec6520faf04aa1d1f941b02d6492af39' 
  AND token = 'jtCTmJBnxCsOTj2LF1NEM3RuZ3YGJ0wKmd+imUjVE2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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