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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75bc3edca43f648c2c851b486cb204567070b98b2ddbc6f6bb164437d82718c' 
  AND token = '0Vcy/xXun11gZRbyjxyQ2wji5TO4IN97+bjlaPxuJLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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