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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305104cb75444c922245b9ab1ebd93636a44608d433316e51fe81d8392861ef9' 
  AND token = '2EnH4r16XZ/zf5Jott294Ux4gFXuEhlHeV/Nmu3Qdlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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