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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9df68cf56cca35f8d62a6966221e3cf2174ce2d8e60901d5af54c72e04eea0' 
  AND token = 'cyPrJUsWixTyS9PtlmYYcH0zMW4v311+mKFP0SoPJWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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