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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc3e8e5231235e705b2f09d553d8d15b565961ed02844e17059d10e3585608e' 
  AND token = 'ok57AhEInfl5H18TWdNSly+0wF2elix7xtquZwfhpFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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