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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feefdcf3bc2e23bf16878b2d4f31c850b7b75b950e4963c0e27d89d2005f6699' 
  AND token = 'kZL/thV45y1Ar6jBZ9KxXzN9lRQ/mcwmPyLL0c1qx9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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