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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460261168e5e91441f7c3544d977d6f690ed9cb39f7e9aae205ced1afcd9ccf5' 
  AND token = 'rZPc7nD01kcn53uS+eRc+p4blpEtzA3yWJRby5sh1i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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