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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf23dac5d37ca4e2c8ed4525293c953dbe81dfe779b7e7c20631615e8a40057' 
  AND token = 'GaGm7HVM/HZ2M6hmbD2KR9zORzB3OqmMwL94487hfMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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