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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7628b39dd6de34b1ff96502cf689a0ed3f8a59a1e4d0c7882b54b910379dd9b5' 
  AND token = 'vEiniAxWJEe8Zrrd9hwSfHJAQ2B2nsHGts2GuUXMCTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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