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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a7303b3edf5d88af6548eebd3f7335f5aa8863602536ff225398b19a8aa5c1' 
  AND token = 'LR2NSHppD84C82I6t57xmNhn5Tf9ITDHCn66RLQcJIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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