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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bafcfda53f1c20b50df2326bc7ee37c41bc555b08506659ffa2eac96e2c378f' 
  AND token = '3cSZH97HMszMEWiAnLVuhT63qR0gKBafsmxPHSEO/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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