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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e09657c8f07c5ef34a7c29ae687f4b4c9cd1cfc982b095fc600be1ead153f75' 
  AND token = 'I5dtD+SFDibKHNFA1btiNNRZj/gbd4x36wx86tzH3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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