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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93795117a8df041726c584cd09728bf77b0f3b14ad6e493d3a1ac3e70fbbaae' 
  AND token = '7BSAddCynhBc4sweCN8ZkXXLKarduac9IuxM2mljUfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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