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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f3527a456140deef91ebd60a4eaf1115517f800e29ab10bde317bcc4a07ad4' 
  AND token = 'yDDSMKpM4ZNrZpTPCwdEH0l/cqdzb8Jqup6DKha4i/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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