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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaee2456c5cf7758b0c183b143137254974f07cd2d2e7e97d749c9d6de8978a0' 
  AND token = '0yBovC+mkCH/ZTpCWEpkgECteQ71uxsZtlimXzQPzBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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