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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb14d3a89c761e0e2eeb152b3d184bebd792313c961c48ea3312b2eadab510cd' 
  AND token = 'kCI61PrtdxQqIDzByrFhc6bJGeB9om7sR91on7vk8o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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