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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bd1ade9c4aed238d44430e2cb3c97da37f16d554072cd65b99c5a97bad7e0a' 
  AND token = '9EdvhhezjZHTSzBW5UYl9/1Q5c2uwH/Z3ONREAs50zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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