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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26725f7daaee8f2b011ae44f3d205bfc167bb4b2341e422b0202949f33ccaf4' 
  AND token = 'RIc6Ke/Qp3jKHbGpEWwuTVOsFkFbCovxI4spTXNv3Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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