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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac4fd3f2e3c4e967abada326c2b0470c3dd015f12b2dca3f05d862a460e7ca7' 
  AND token = 'fGf2TN3hu8MIwvTJMt3u7dUAnMSz1dhGZCgTWintrL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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