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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e275ba4c89a2d49504387761d6a3cc464c02daca101a60ca70ec0de3ce1687' 
  AND token = '1SgppPFyXj06qMG5UGejDqQJ6cNbHO5/wacQ3LZff5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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