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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2467c6322c7c5cb382d406a57149f4982b8d2fc42f743bbce9e2fbdf02a0648' 
  AND token = 'EJXwQDGdHcQUNQFXJhperjXZPotu2axt+knCm3lHjfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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