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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cb99d21de6a2eb951cc72e958cd74fab531038c1ba7e85bc39ddda219974ca' 
  AND token = 'F2Hbta2GORbd1M2NJ6J5ei+I32w5gf8VFEL2UyDwaBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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