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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cd76e7fcb4d0cadd89a547055664cf38e0b62cee76afc07d88b80095c21989' 
  AND token = 'fCS9NG3yi2VXsp6V28gyO4d0HtTkg8fVXxrBBMNLv94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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