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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f2f99d056293046790daf493ee218f2e10829be4305eb59777493902fc6570' 
  AND token = 'GYUYcaldrea+NjEumbmBtkWixNOm/LF76VPnTi/SsyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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