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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b0f84aa852cf9eedb0bcb8758e76b1ddd23e996976f298a307a7e88f4f9e84' 
  AND token = 'rJRGPCMmcqMaursp3ypl0DNqHRX6RG6I+EK2kzBoqYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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