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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f05d601cae795e8329c6e32166576eaacd8bb9db36a4ff849d28bb829b16da' 
  AND token = 'WO1I0mfBToo+Fb+qnV/HusezVukTPAb4zht1a2w2RTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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