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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddbbb1ad9e66762b2b4025fe82296ac616de69b842efc3901d59654ec9087c2' 
  AND token = 'q8bxCumXnz9vj9LCievGrljXPhb4A1C1PqbYv1sF9sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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