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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd681f429f270c15e2ef8303ec85ad1c8a8837af59ab00928583da7cdb7eb5c6c' 
  AND token = 'Kb0esSYKFMcTpK11yYaxMNkvbazUWKef7qknPqnO66Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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