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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c2cc5938ee0c11d65c34f47871d5a428afa2c820ab23b84840f889ac5783c6' 
  AND token = 'JrC0iI6NFKJDgUcoDCHmlgLM2pQ4G9gdKf+f4dj2/UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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