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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9fc0468a9479e43ded1b57e0532e2056dd074608af3734ace014a8b502cee2' 
  AND token = 'CrkWIXqLR2UvAi8cD4XTdJfROaDEci2l5zS/g9VeKw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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