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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8f8777fef0d701457c42d6e30733a5578c3f5bd5700d765fe261b1caf9e919' 
  AND token = 'Br/6MMk8ADyy7kUf0Ph5r06Xa7uFUHGBc6x+ifbKKHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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