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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b12126138d1427bd59cd95a97f5f382994cd02975ca63458b1f0fd93c50bb3c' 
  AND token = '6zyw5IUDLYyA3gjUaauhX4ztnpy8y6jO+bkqJWSO9As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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