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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4def31eb23a9270e69ae7f0a27327223b8c7d5f198148a3c1ffe8b99722a87' 
  AND token = 'KevCszCvo+GEXiVrx/RCxx+oAkMNv221fBEo0kWANDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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