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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2a74c56fbc301f9d1b584ebcb44e7ffecd3e44684965df2c63d669097cdcea' 
  AND token = 'XD3zsKRCsuz4uHabJsk2iy3q0rIkGm2G1cnpgU4HDH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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