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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5ca6da064ff41bc8b8e880cec8169acd7dc5d6103e0e6319bcb18e69bfa90a' 
  AND token = 'MvdpP+fSthz7dIjm2BxfYboUHfNR4qrtpJToHglLXMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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