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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71635a63a9485d64ec7c308f2d40746a0e3e5fb503e1c4a07b9f43e1d4ecb4a' 
  AND token = 'FEi9Li9VOTiuxmmgoc6y8B4qrEX78XODY7t3UJ026K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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