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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1c23c789e4d4b033c1a5a1e66fb9321bd9a8d606490bcb714276554a94ccec' 
  AND token = '3Slru51bXd8/M2ZneWLCWn4TPwS1q2a1F1+56X6AuTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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