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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e267e9ae2d095ffe14dbedb58084365f0df9dc42cdab9ed59447dba89aa89545' 
  AND token = 'poHLKWNhQi8N7cIwdJHmPZWqXsN2umehVUDg2DzEv/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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