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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4f9e81e3f39982adc03d912b35d6accee5c18cafb86fb6229f3089bfd9ebb5' 
  AND token = 'Ou2YZ9ozhHyiFYvZVEVUayhH0rDSr0RwVEcdamNcv90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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