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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8a03e0ff4b5d61b0d5124fa1bb2ced12d0b6c7970970785dbbe2ab79ec5954' 
  AND token = 'dXoe6zsehCq5C2kJiz6Gx7BhbMcVKNKCIN0popG5DMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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