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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1349c7c14eb8d2be7e1c83dbafc093c31dbe7aada42dbfbbe2943f14483c0c1' 
  AND token = 'ggeae21gOw9+SwR/xUXxGgw41p8d07cA62bomoWobns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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