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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b7985f98e5f34541e8abc1f7758ed8c647cc348b26e0692ffbc7fcc84cdb06' 
  AND token = 'HQ2dQrbX4Mc4XF+NmHNaFuCRRJuqkCX9HR0u/5sgA4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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